Picture frame



1.1 is a perspective view of a picture frame, showing my new design;

1.2 is a side view thereof;

1.3 is a top view thereof;

1.4 is an enlarged partial exploded view of the picture frame of 1.1; and

1.5 is an enlarged partial view of the picture frame of 1.1. 

CLAIM The ornamental design for a picture frame, as shown and described. 